A commenter on the UCC initial post notes that this same-sex-marriage stuff is old news to UUs. You can check out Unitarian Universalist-related gay rights (including marriage-equality) history here.
The UCC is a lot bigger and many people pay attention to self-identified Christians. While Garrison Keillor, Doonesbury, Kudzu and even UUs have a lot of fun joking about the denomination, folks tend to take even liberal mainline Protestents more seriously.
Truth is, UUs are almost always out there first on justice and equality issues. They did the same-sex marriage resolution nine years ago. However, that surprised almost no one.
Now if the United Methodists or Southern Baptists could see the light, that would be newsworthy
Fair Disclosure: I'm a UU.